So, I messed up my 8.1.0-20U Old 3ds by accidentally updating to 9.5.0-9U. I did have a backup NAND.bin for 8.1.0-20U with my Gateway card, but I mistakenly misplaced it. Is there any other way I can downgrade my old 3ds or get another nand.bin file? I know if I use Gateway, I can downgrade with my old Nand file, but is that the only way I can downgrade? Any help would be great.